Comparative Stu4y on Biodiversity and Stand Growth Regukation in Pinus taiwanensis from Different Origin

Through the field investigation and analysis of Pinus taiwanensis community from the natural forest and plantation,it can be seen that the biodiversity in the natural forest was obviously higher than that in the plantation,and there was a difference of species composition with 19～29 species in natural forest and 9～17 in plantation.Shannon-Wiener Diversity Indices of the undergrowth and herb laver were 2.8242～2.8763 and 1.7998～1.8366 in the natural forest,and 1.6073～2.0775 and 1.836 6～1.9394 in the plantation,respectively. The DBH increment of the natural forest was 0.47 cm/a lower than that of the plantation.The maximum current annual increment of tree height in the natural forest happened at the twentieth year,and it was 5 years later than that in plantation. The significantvolun、eincrement(0.01 m3/a)of the natural forest occurred after the growth of 40 a,which was 20 a later than that of the plantation. Evenness Index,Coefficient of Community(CC),Coefficient of Similarity,and coenological difference of Pinus taiwanensis between them were discussed,and tree growth process from two origins of stands was also compared and analyzed.